基于子属性的e4x查询

Question

我正在尝试执行一个 E4X 查询（在下面的 xml 中），它将返回所有包含“元数据”节点的“访问器”节点，该节点的“名称”属性等于“必需”。

我试过了……

type.accessor.(metadata.@name == "Required")

...但这仅适用于只有 1 个元数据节点的访问节点。

有什么线索吗？

<type name="org.springextensions.actionscript.ioc.testclasses::PersonRequiredName" base="org.springextensions.actionscript.ioc.testclasses::Person" isDynamic="false" isFinal="false" isStatic="false">
  <metadata name="__go_to_definition_help">
    <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\PersonRequiredName.as"/>
    <arg key="pos" value="935"/>
  </metadata>
  <extendsClass type="org.springextensions.actionscript.ioc.testclasses::Person"/>
  <extendsClass type="Object"/>
  <constructor>
    <parameter index="1" type="String" optional="true"/>
    <parameter index="2" type="int" optional="true"/>
    <parameter index="3" type="Boolean" optional="true"/>
  </constructor>
  <accessor name="name" access="readwrite" type="String" declaredBy="org.springextensions.actionscript.ioc.testclasses::PersonRequiredName">
    <metadata name="Required"/>
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\PersonRequiredName.as"/>
      <arg key="pos" value="1163"/>
    </metadata>
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\PersonRequiredName.as"/>
      <arg key="pos" value="1249"/>
    </metadata>
  </accessor>
  <variable name="age" type="int">
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="1070"/>
    </metadata>
  </variable>
  <accessor name="siblings" access="readonly" type="Array" declaredBy="org.springextensions.actionscript.ioc.testclasses::Person">
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="3724"/>
    </metadata>
  </accessor>
  <method name="addFriend" declaredBy="org.springextensions.actionscript.ioc.testclasses::Person" returnType="void">
    <parameter index="1" type="org.springextensions.actionscript.ioc.testclasses::Person" optional="false"/>
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="2424"/>
    </metadata>
  </method>
  <method name="toString" declaredBy="org.springextensions.actionscript.ioc.testclasses::Person" returnType="String">
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="3181"/>
    </metadata>
  </method>
  <method name="helloWorld" declaredBy="org.springextensions.actionscript.ioc.testclasses::Person" returnType="String">
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="2159"/>
    </metadata>
  </method>
  <method name="equals" declaredBy="org.springextensions.actionscript.ioc.testclasses::Person" returnType="Boolean">
    <parameter index="1" type="org.springextensions.actionscript.ioc.testclasses::Person" optional="false"/>
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="1932"/>
    </metadata>
  </method>
  <method name="hasSibling" declaredBy="org.springextensions.actionscript.ioc.testclasses::Person" returnType="Boolean">
    <parameter index="1" type="org.springextensions.actionscript.ioc.testclasses::Person" optional="false"/>
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="2789"/>
    </metadata>
  </method>
  <accessor name="writeObject" access="writeonly" type="Object" declaredBy="org.springextensions.actionscript.ioc.testclasses::Person">
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="3950"/>
    </metadata>
  </accessor>
  <variable name="colleague" type="org.springextensions.actionscript.ioc.testclasses::Person">
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="1132"/>
    </metadata>
  </variable>
  <variable name="anArray" type="Array">
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="1166"/>
    </metadata>
  </variable>
  <method name="addSibling" declaredBy="org.springextensions.actionscript.ioc.testclasses::Person" returnType="void">
    <parameter index="1" type="org.springextensions.actionscript.ioc.testclasses::Person" optional="false"/>
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="2605"/>
    </metadata>
  </method>
  <variable name="anObject" type="Object">
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="1197"/>
    </metadata>
  </variable>
  <accessor name="friends" access="readwrite" type="Array" declaredBy="org.springextensions.actionscript.ioc.testclasses::Person">
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="3583"/>
    </metadata>
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="3645"/>
    </metadata>
  </accessor>
  <accessor name="isMarried" access="readwrite" type="Boolean" declaredBy="org.springextensions.actionscript.ioc.testclasses::Person">
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="3434"/>
    </metadata>
    <metadata name="__go_to_definition_help">
      <arg key="file" value="C:\workspace\spring-actionscript\core\src\test\actionscript\org\springextensions\actionscript\ioc\testclasses\Person.as"/>
      <arg key="pos" value="3502"/>
    </metadata>
  </accessor>
</type>

Answer 1

这似乎有效：

type.accessor.(hasOwnProperty("metadata") && metadata.attribute("name").contains("Required"))

Answer 2

这都是关于括号的。

试试这个（更干净）

var list:XMLList;

xmlList = type.accessor.metadata.(@name == "Required");